ttystikk
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Something that directly affects nutrient takeup and is so often ignored I just suggest starting there; humidity. If your humidity levels changed (and as seasons change it is very likely to change the RH in your room) that could be a cause of your Ca problems.
Low humidity levels force plants to take up more moisture to compensate, which is why you run low values for nutes in dry climates. The opposite is also true and is easier to miss; when humidity climbs, your EC should climb with it, even as high as 2.4 with high humidity levels of 65% or more. When humidity climbs and EC doesn't, the plant will start to starve for nutes because it isn't bringing enough up with the water it's transpiring.
Ca is one of the worst offenders with this, because it's immobile and the affected leaves will not recover if all you do is change the nutes your roots see. Seamaiden's suggestion to foliar feed immobile nutrients is wise for this reason. When I sealed my room and could maintain humidity levels above 20% (!), I noticed my girls needed higher EC- and when they got it they really took off! To be specific, I added 5ml/gal of cal-mag in the dry, and 10 after the room was sealed. This was on top of whatever Ca the nutes had already. I'm in 50/50 coco/hydroton mix.
Low humidity levels force plants to take up more moisture to compensate, which is why you run low values for nutes in dry climates. The opposite is also true and is easier to miss; when humidity climbs, your EC should climb with it, even as high as 2.4 with high humidity levels of 65% or more. When humidity climbs and EC doesn't, the plant will start to starve for nutes because it isn't bringing enough up with the water it's transpiring.
Ca is one of the worst offenders with this, because it's immobile and the affected leaves will not recover if all you do is change the nutes your roots see. Seamaiden's suggestion to foliar feed immobile nutrients is wise for this reason. When I sealed my room and could maintain humidity levels above 20% (!), I noticed my girls needed higher EC- and when they got it they really took off! To be specific, I added 5ml/gal of cal-mag in the dry, and 10 after the room was sealed. This was on top of whatever Ca the nutes had already. I'm in 50/50 coco/hydroton mix.